A number of projectiles each with same speed u are fired at different angles lying between 0 and 90 as shown Neglecting air

Question

A number of projectiles each with same speed u are fired at different angles lying between 0 and 90 as shown Neglecting air resistance and assuming g to be constant then the equation of the envelop E of the parabolic trajectories as shown in figure is Y C E 92 O 27

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